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Isotope Studies on the Efficient Use of P-Fertilizers by Coffea arabica in Kenya I. Uptake And Distribution of P32 from labelled KH2PO4

Published online by Cambridge University Press:  03 October 2008

R. Z. Patel  and
A. M. Kabaara
R. Z. Patel
Affiliation:
Coffee Research Station, Ruiru, Kenya
A. M. Kabaara
Affiliation:
Coffee Research Station, Ruiru, Kenya
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Summary

Uptake of P32 from labelled KH2PO4 solutions, injected in the top-soil at points distributed over 4000 cm.2 in the zone of high root activity, was measurable soon after application with accumulation of P32 in leaves increasing thereafter with time. The recently-acquired P32 was distributed uniformly in the tree canopies. Uptake of P32 reached a maximum when the number of injection points was increased from 15 to 30 per tree, with 45 and 60 injection points leading to little further change in P32 content of leaves. In the zone of high root activity, strip application of P32 was as efficient as application in a circle around each tree. The practical implications of these observations in relation to P-fertilization of coffee are discussed.

Type
Research Article
Information
Experimental Agriculture , Volume 11 , Issue 1 , January 1975 , pp. 1 - 11
Copyright
Copyright © Cambridge University Press 1975

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References

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